Russian troops moving swiftly to take control of military bases in crimea where voters decided to rejoin Russia. Those troops shooting their way into one of the bases. After they did, look at this, a surveillance camera that had been recording people coming and going outside that basement you see the soldiers hand there reaching in and ripping it out. That camera going black. Our team finding themselves in the middle of the fire storm. Russian authorities demanding that Alex and our team turn over their material. They did not and Alex reports from crimea. Reporter: Armored Russian vehicles burst through the walls firing warning shots and throwing sound grenades. Ukrainian forces have set up a perimeter and we are completely surrounded. By Russian forces. Reporter: Rifles at the ready. The mostly unarmed Ukrainians were ordered not to fight back. Commanders trying to avoid blood shed. This is a tense stand off. Between the Russian special forces right there and the Ukrainian solders who have turned their back on the Russian. Refuo surrender but they may have no choice. Reporter: Calling his men to attention and thanked them for their service. Before they proudly burst into the national anthem. Then the Russian forces kicked us out and tried to confiscate our footage and then seized control of the base and arrested colonel manchur. Another crimeaen base also taken over by forces as Russia completes its take over of crimea. Reporter: There are fears tonight that despite the sarngss against Russia that Russia may not be done. The U.S. Is concerned that a buildup of thousands of Russian troops means that could be the next target.

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